If enough others find themselves with a similar use case, perhaps you'd consider adding this feature...

When looking for a past saved session to restore, I find myself scrolling past all of my "Autosave Sessions" in the sidebar in order to get to the "Saved Sessions" section. It would be great if I could click on a disclosure triangle in the "Autosave Sessions" sidebar header and collapse those sessions from view. The same might be useful for the "Saved Sessions" sidebar header, so that I could quickly scroll through all of my autosaved sessions and clearly see where that list ends because the next section ("Saved Sessions") is collapsed and hidden from view.